The BBC joined US, Japanese and Australian troops in remote North Queensland, where they trained together in some of Australia's toughest terrain.
- +What are US and Japanese soldiers doing in the middle of the Australian bush?
But why were these exercises taking place in Australia - a country not at war, thousands of kilometres from today's major conflicts?
Sade Ogunleye
But why were these exercises taking place in Australia - a country not at war, thousands of kilometres from today's major conflicts?
Our Australia correspondent Katy Watson explains.
